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Movement Ecology

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https://www.readbyqxmd.com/read/29142755/time-versus-energy-minimization-migration-strategy-varies-with-body-size-and-season-in-long-distance-migratory-shorebirds
#1
Meijuan Zhao, Maureen Christie, Jonathan Coleman, Chris Hassell, Ken Gosbell, Simeon Lisovski, Clive Minton, Marcel Klaassen
Background: Migrants have been hypothesised to use different migration strategies between seasons: a time-minimization strategy during their pre-breeding migration towards the breeding grounds and an energy-minimization strategy during their post-breeding migration towards the wintering grounds. Besides season, we propose body size as a key factor in shaping migratory behaviour. Specifically, given that body size is expected to correlate negatively with maximum migration speed and that large birds tend to use more time to complete their annual life-history events (such as moult, breeding and migration), we hypothesise that large-sized species are time stressed all year round...
2017: Movement Ecology
https://www.readbyqxmd.com/read/29085642/the-symbiotic-magnetic-sensing-hypothesis-do-magnetotactic-bacteria-underlie-the-magnetic-sensing-capability-of-animals
#2
Eviatar Natan, Yoni Vortman
The ability to sense Earth's magnetic field has evolved in various taxa. However, despite great efforts to find the 'magnetic-sensor' in vertebrates, the results of these scientific efforts remain inconclusive. A few decades ago, it was found that bacteria, known as magnetotactic bacteria (MTB), can move along a magnetic field using nanometric chain-like structures. Still, it is not fully clear why these bacteria evolved to have this capacity. Thus, while for MTB the 'magnetic-sensor' is known but the adaptive value is still under debate, for metazoa it is the other way around...
2017: Movement Ecology
https://www.readbyqxmd.com/read/29043084/multi-species-genetic-connectivity-in-a-terrestrial-habitat-network
#3
Robby R Marrotte, Jeff Bowman, Michael G C Brown, Chad Cordes, Kimberley Y Morris, Melanie B Prentice, Paul J Wilson
BACKGROUND: Habitat fragmentation reduces genetic connectivity for multiple species, yet conservation efforts tend to rely heavily on single-species connectivity estimates to inform land-use planning. Such conservation activities may benefit from multi-species connectivity estimates, which provide a simple and practical means to mitigate the effects of habitat fragmentation for a larger number of species. To test the validity of a multi-species connectivity model, we used neutral microsatellite genetic datasets of Canada lynx (Lynx canadensis), American marten (Martes americana), fisher (Pekania pennanti), and southern flying squirrel (Glaucomys volans) to evaluate multi-species genetic connectivity across Ontario, Canada...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28944062/coupling-spectral-analysis-and-hidden-markov-models-for-the-segmentation-of-behavioural-patterns
#4
Karine Heerah, Mathieu Woillez, Ronan Fablet, François Garren, Stéphane Martin, Hélène De Pontual
BACKGROUND: Movement pattern variations are reflective of behavioural switches, likely associated with different life history traits in response to the animals' abiotic and biotic environment. Detecting these can provide rich information on the underlying processes driving animal movement patterns. However, extracting these signals from movement time series, requires tools that objectively extract, describe and quantify these behaviours. The inference of behavioural modes from movement patterns has been mainly addressed through hidden Markov models...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28904797/a-cross-validation-based-approach-for-delimiting-reliable-home-range-estimates
#5
Eric R Dougherty, Colin J Carlson, Jason K Blackburn, Wayne M Getz
BACKGROUND: With decreasing costs of GPS telemetry devices, data repositories of animal movement paths are increasing almost exponentially in size. A series of complex statistical tools have been developed in conjunction with this increase in data. Each of these methods offers certain improvements over previously proposed methods, but each has certain assumptions or shortcomings that make its general application difficult. In the case of the recently developed Time Local Convex Hull (T-LoCoH) method, the subjectivity in parameter selection serves as one of the primary impediments to its more widespread use...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28861272/three-dimensional-space-use-during-the-bottom-phase-of-southern-elephant-seal-dives
#6
Yves Le Bras, Joffrey Jouma'a, Christophe Guinet
BACKGROUND: In marine pelagic ecosystems, the spatial distribution of biomass is heterogeneous and dynamic. At large scales, physical processes are the main driving forces of biomass distribution. At fine scales, both biotic and abiotic parameters are likely to be key determinants in the horizontal and vertical distribution of biomass, with direct consequences on the foraging behaviour of diving predators. However, fine scale three-dimensional (3D) spatial interactions between diving predators and their prey are still poorly known...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28861271/no-apparent-gain-from-continuing-migration-for-more-than-3000%C3%A2-kilometres-willow-warblers-breeding-in-denmark-winter-across-the-entire-northern-savannah-as-revealed-by-geolocators
#7
Mathilde Lerche-Jørgensen, Mikkel Willemoes, Anders P Tøttrup, Katherine Rachel Scotchburn Snell, Kasper Thorup
BACKGROUND: For most Afro-Palearctic migrants, particularly small songbirds, spatiotemporal migration schedules and migratory connectivity remain poorly understood. We mapped migration from breeding through winter of one of the smallest Afro-Palearctic migrants, the willow warbler Phylloscopus trochilus, using geolocators (n = 15). RESULTS: Birds migrated from North European breeding grounds to West Africa via the Iberian Peninsula following a narrow corridor along the West Coast of Africa...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28725435/biogeophysical-and-physiological-processes-drive-movement-patterns-in-a-marine-predator
#8
Lucy A Howey, Bradley M Wetherbee, Emily R Tolentino, Mahmood S Shivji
BACKGROUND: Blue sharks (Prionace glauca) are among the most abundant and widely distributed of oceanic elasmobranchs. Millions are taken annually in pelagic longline fisheries and comprise the highest component of auctioned fin weight in the international shark fin trade. Though studies of blue sharks outnumber those of other large pelagic sharks, the species' complicated and sexually segregated life history still confound current understanding of Atlantic movement patterns. Lack of detailed information regarding movement and vertical behavior continues to limit management efforts that require such data for stock assessment and sustainable catch modeling...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28680638/migratory-blackpoll-warblers-setophaga-striata-make-regional-scale-movements-that-are-not-oriented-toward-their-migratory-goal-during-fall
#9
J Morgan Brown, Philip D Taylor
BACKGROUND: Regional scale movement patterns of songbirds are poorly known largely due to difficulties tracking small organisms at broad scales. Using an array of over 100 automated radio telemetry towers, we followed Blackpoll Warblers (Setophaga striata) during fall migration in the Gulf of Maine region, and assessed how their regional scale movement pathways varied with age, distance to natal origin, and capture date. RESULTS: Many individuals had movement paths that were not oriented towards their migratory goal ('indirect movement patterns'), regardless of age, distance to natal origin, or time of season...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28630712/quantifying-drivers-of-wild-pig-movement-across-multiple-spatial-and-temporal-scales
#10
Shannon L Kay, Justin W Fischer, Andrew J Monaghan, James C Beasley, Raoul Boughton, Tyler A Campbell, Susan M Cooper, Stephen S Ditchkoff, Steve B Hartley, John C Kilgo, Samantha M Wisely, A Christy Wyckoff, Kurt C VerCauteren, Kim M Pepin
BACKGROUND: The movement behavior of an animal is determined by extrinsic and intrinsic factors that operate at multiple spatio-temporal scales, yet much of our knowledge of animal movement comes from studies that examine only one or two scales concurrently. Understanding the drivers of animal movement across multiple scales is crucial for understanding the fundamentals of movement ecology, predicting changes in distribution, describing disease dynamics, and identifying efficient methods of wildlife conservation and management...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28580149/suite-of-simple-metrics-reveals-common-movement-syndromes-across-vertebrate-taxa
#11
Briana Abrahms, Dana P Seidel, Eric Dougherty, Elliott L Hazen, Steven J Bograd, Alan M Wilson, J Weldon McNutt, Daniel P Costa, Stephen Blake, Justin S Brashares, Wayne M Getz
BACKGROUND: Because empirical studies of animal movement are most-often site- and species-specific, we lack understanding of the level of consistency in movement patterns across diverse taxa, as well as a framework for quantitatively classifying movement patterns. We aim to address this gap by determining the extent to which statistical signatures of animal movement patterns recur across ecological systems. We assessed a suite of movement metrics derived from GPS trajectories of thirteen marine and terrestrial vertebrate species spanning three taxonomic classes, orders of magnitude in body size, and modes of movement (swimming, flying, walking)...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28496983/correlated-velocity-models-as-a-fundamental-unit-of-animal-movement-synthesis-and-applications
#12
Eliezer Gurarie, Christen H Fleming, William F Fagan, Kristin L Laidre, Jesús Hernández-Pliego, Otso Ovaskainen
BACKGROUND: Continuous time movement models resolve many of the problems with scaling, sampling, and interpretation that affect discrete movement models. They can, however, be challenging to estimate, have been presented in inconsistent ways, and are not widely used. METHODS: We review the literature on integrated Ornstein-Uhlenbeck velocity models and propose four fundamental correlated velocity movement models (CVM's): random, advective, rotational, and rotational-advective...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28484599/to-migrate-stay-put-or-wander-varied-movement-strategies-in-bald-eagles-haliaeetus-leucocephalus
#13
Rachel E Wheat, Stephen B Lewis, Yiwei Wang, Taal Levi, Christopher C Wilmers
BACKGROUND: Quantifying individual variability in movement behavior is critical to understanding population-level patterns in animals. Here, we explore intraspecific variation in movement strategies of bald eagles (Haliaeetus leucocephalus) in the north Pacific, where there is high spatiotemporal resource variability. We tracked 28 bald eagles (five immature, 23 adult) using GPS transmitters between May 2010 and January 2016. RESULTS: We found evidence of four movement strategies among bald eagles in southeastern Alaska and western Canada: breeding individuals that were largely sedentary and remained near nest sites year-round, non-breeding migratory individuals that made regular seasonal travel between northern summer and southern winter ranges, non-breeding localized individuals that displayed fidelity to foraging sites, and non-breeding nomadic individuals with irregular movement...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28469920/continuous-movement-behavior-of-humpback-whales-during-the-breeding-season-in-the-southwest-indian-ocean-on-the-road-again
#14
Violaine Dulau, Patrick Pinet, Ygor Geyer, Jacques Fayan, Philippe Mongin, Guillaume Cottarel, Alexandre Zerbini, Salvatore Cerchio
BACKGROUND: Humpback whales are known to undertake long-distance migration between feeding and breeding sites, but their movement behavior within their breeding range is still poorly known. Satellite telemetry was used to investigate movement of humpback whales during the breeding season and provide further understanding of the breeding ecology and sub-population connectivity within the southwest Indian Ocean (SWIO). Implantable Argos satellite tags were deployed on 15 whales (7 males and 6 females) during the peak of the breeding season in Reunion Island...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28451434/a-few-long-versus-many-short-foraging-trips-different-foraging-strategies-of-lesser-kestrel-sexes-during-breeding
#15
Jesús Hernández-Pliego, Carlos Rodríguez, Javier Bustamante
BACKGROUND: In species with biparental care both members of the breeding pair cooperate to raise the offspring either by assisting each other in every reproductive task or by specializing in different ones. The latter case is known as reproductive role specialization. Raptors are considered one of the most role-specialized groups, but little is known about parental behavior away from the nest. Until the advent of biologgers, avian role specialization was traditionally studied with direct observations at the nest because of the difficulties of following and recording the behavior of free-ranging individuals...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28417004/the-effect-of-relatedness-and-pack-size-on-territory-overlap-in-african-wild-dogs
#16
Craig R Jackson, Rosemary J Groom, Neil R Jordan, J Weldon McNutt
BACKGROUND: Spacing patterns mediate competitive interactions between conspecifics, ultimately increasing fitness. The degree of territorial overlap between neighbouring African wild dog (Lycaon pictus) packs varies greatly, yet the role of factors potentially affecting the degree of overlap, such as relatedness and pack size, remain unclear. We used movement data from 21 wild dog packs to calculate the extent of territory overlap (20 dyads). RESULTS: On average, unrelated neighbouring packs had low levels of overlap restricted to the peripheral regions of their 95% utilisation kernels...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28417003/migration-distance-as-a-selective-episode-for-wing-morphology-in-a-migratory-insect
#17
D T Tyler Flockhart, Blair Fitz-Gerald, Lincoln P Brower, Rachael Derbyshire, Sonia Altizer, Keith A Hobson, Leonard I Wassenaar, D Ryan Norris
BACKGROUND: Selective pressures that occur during long-distance migration can influence morphological traits across a range of taxa. In flying insects, selection should favour individuals that have wing morphologies that increase energy efficiency and survival. In monarch butterflies, differences in wing morphology between migratory and resident populations suggest that migratory populations have undergone selection for larger (as measured by length and area) and more elongated (as measured by roundness and aspect ratio) forewings...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28357113/identification-of-animal-movement-patterns-using-tri-axial-magnetometry
#18
Hannah J Williams, Mark D Holton, Emily L C Shepard, Nicola Largey, Brad Norman, Peter G Ryan, Olivier Duriez, Michael Scantlebury, Flavio Quintana, Elizabeth A Magowan, Nikki J Marks, Abdulaziz N Alagaili, Nigel C Bennett, Rory P Wilson
BACKGROUND: Accelerometers are powerful sensors in many bio-logging devices, and are increasingly allowing researchers to investigate the performance, behaviour, energy expenditure and even state, of free-living animals. Another sensor commonly used in animal-attached loggers is the magnetometer, which has been primarily used in dead-reckoning or inertial measurement tags, but little outside that. We examine the potential of magnetometers for helping elucidate the behaviour of animals in a manner analogous to, but very different from, accelerometers...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28331618/movement-of-leopard-tortoises-in-response-to-environmental-and-climatic-variables-in-a-semi-arid-environment
#19
Martyn Drabik-Hamshare, Colleen T Downs
BACKGROUND: Tortoises (Testudinidae) occur in a wide range of environments, providing important ecosystem functions, such as seed dispersal and refuge in the form of burrows. Tortoise movement has previously been shown to be related to resource availability, reproductive status and local environmental conditions. However, understanding of the variables that drive their movement remains comparatively low. We investigated aspects of movement in leopard tortoises Stigmochelys pardalis-the largest and most abundant tortoise species in sub-Saharan Africa-in response to environmental, climatic and individual variables in the semi-arid Karoo, South Africa...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28270913/effects-of-environmental-features-and-sport-hunting-on-caribou-migration-in-northwestern-alaska
#20
Timothy J Fullman, Kyle Joly, Andrew Ackerman
BACKGROUND: Ungulate movements are influenced by a variety of biotic and abiotic factors, which may affect connectivity between key resource areas and seasonal ranges. In northwestern Alaska, one important question regarding human impacts on ungulate movement involves caribou (Rangifer tarandus) response to autumn hunting and related aircraft activity. While concerns have been voiced by local hunters about the influence of transporter aircraft and non-local sport hunters, there has been little quantitative analysis of the effects of hunter activity on caribou movement...
2017: Movement Ecology
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